I wouldn't describe a graph as a (numerical) figure. " The expression works in your final sentence, because you are referring to only the two final figures. " You might want to rethink this.
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Anonymous should I say 'the two graphs show opposite inclinations'.The problem is that you can't have it both ways. As GG says, you have one box with two lines in it. If you decide you want to call each line "a graph," then you have to come up with another name for the box. You can't say, "I have a graph which shows two graphs."